Motorcycle exhaust system



FIG. 1 is a perspective view of the motorcycle exhaust system, shown in position of use from the right side of a motorcycle.

FIG. 2 is a right side of the motorcycle exhaust system shown in FIG. 1; and,

FIG. 3 is a top view of a motorcycle exhaust system shown in FIG. 1.

The broken line showing of the environment is for illustrative purposes only and forms no part of the claimed design. 

We claim the ornamental design for a motorcycle exhaust system, as shown and described. 